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Performance optimization of LSCF/Gd:CeO2 composite cathodes via single-step inkjet printing infiltration
R I Tomov1, Tom Mitchell-Williams1, Chenlong Gao1
11Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge, CB3 0FS UK.
Journal of Applied Electrochemistry
|February 28, 2020
Summary
Inkjet printing infiltration enhances solid oxide fuel cell (SOFC) cathode performance by nano-decorating with gadolinium doped ceria. This modification improves electrochemical activity and stability, offering a cost-effective route for SOFC commercialization.
Area of Science:
- Materials Science
- Electrochemistry
- Chemical Engineering
Background:
- Solid oxide fuel cells (SOFCs) are promising clean energy conversion devices.
- Cathode microstructure significantly impacts SOFC electrochemical performance and durability.
- Current methods for cathode modification can be complex and costly.
Purpose of the Study:
- To investigate the effect of nano-decoration on SOFC cathode microstructure and electrochemical activity.
- To explore inkjet printing infiltration as a method for cathode modification.
- To assess the stability of modified SOFC cathodes.
Main Methods:
- Fabrication of La0.6Sr0.4Co0.2Fe0.8O3-δ:Ce0.9Gd0.1O1.9 composite cathodes with varying ratios (60:40 and 40:60 vol%) using inkjet printing.
- Single-step inkjet printing infiltration of Ce0.9Gd0.1O1.9 ink onto cathode scaffolds.
- Heat treatment at 550 °C in air.
- Electrochemical impedance spectroscopy (EIS) on symmetrical cells.
- Long-term ageing tests (up to 60 h) in air.
Main Results:
- Nano-decoration of cathode surfaces with Ce0.9Gd0.1O1.9 particles (20-120 nm) was achieved.
- Enhanced active triple phase boundary and oxygen surface exchange kinetics were observed.
- Polarization resistance was reduced by 1.3 to 2.9 times, particularly in 60:40 vol% cathodes.
- Infiltrated electrodes showed enhanced stability, suppressing SrO surface segregation during ageing.
Conclusions:
- Single-step inkjet printing infiltration is an effective method for nano-engineering SOFC cathode microstructures.
- This approach leads to significant improvements in electrochemical activity and operational stability.
- The technique offers a reproducible and cost-effective route for commercial SOFC manufacturing.
